Bit of a thread mine here, Im in the process of buying new genuine pulley's, tensioner and drive belt and noticed the BF FG belt is different over the BA does anyone know the actual difference between the two? The Idler pulley, Tensioner share the same part number BA through till FG. I know the alternators have a different plug but I was under the impression they bolted up the same so not sure why the new belt? Only asking im still not sure what block ill be using (BA,BF,FG)